First report of Heilus freyreissi (Coleoptera: Curculionidae) attacking avocado and associated with Colletotricum sp. in Brazil.
The curculionid genus Heilus is represented by 18 species, 4 occurring in Central America and 14 in South America (O'Brien & Wibmer 1982). In Brazil, 11 species are reported, which are distributed throughout all states (Wibmer & O'Brien 1986; CTFB 2017; Splink 2017). To date, the genus Heilus has not been reported to cause economic damage to avocado production, and little is known about its hosts and interactions with pathogens.
Here, we report the first recorded occurrence of Heilus freyreissi Boheman (Coleoptera: Curculionidae) on avocado. Research on the presence of a new species of Heilus feeding on avocado would aid in the development of control strategies and provide basic information on this species.
Adults of the species H. freyreissi were found in 3 avocado orchards in the municipality of Rio Paranaiba, state of Minas Gerais, Brazil, in Oct 2016. The first orchard was located at 19.4358[degrees]S, 46.2836[degrees]W (1,176 masl) and was planted in 2004. The planting had an area of 18 ha and was planted with 'Margarida' cultivar with a spacing of 8 m between rows and 6 m between plants. The 2nd orchard was located at 19.4355[degrees]S, 46.2858[degrees]W (1,176 masl) and was planted in 2004. The planting had an area of 12 ha and was planted with 'Breda' cultivar, with 8 m spacing between rows and 6 m between plants. The 3rd orchard was located at 19.4122[degrees]S, 46.2662[degrees]W (1,176 masl) and was planted in 2005. The planting had an area of 15 ha and was planted with cultivar 'Hass' at a spacing of 9 m between rows and 6 m between plants.
The climate of the region is a semi-humid tropical zone with an average annual temperature of 22 [degrees]C. The average annual rainfall is 1,500 mm per year, with 2 well-defined seasons: 1 cold and dry [Apr to Sep), and the other hot and rainy (Oct to Mar (Alvares et al. 2013).
For this study, 33 avocado fruits and branches were evaluated in 3 orchards, and the number of fruits and branches with Heilus spp. were counted. In the Margarida cultivar, 76% of branches and fruits had injury, while in the Breda and Hass cultivars, the injury was 100%.
Adult specimens (13 males and 3 females) were collected, stored in a 13 mL vial containing 70% v/v ethyl alcohol, and sent to Dr. Marinez Isaac Marques, Dr. Wesley Oliveira de Sousa, and Aline de Oliveira Lira for identification. The identified specimens were deposited in the Fr. J. S. Moure entomology collection at the Department of Zoology, Federal University of Parana.
Adult H. freyreissi (Fig. 1A) were found commonly in clusters under the bark of avocado tree trunks (Fig. 1C). The pest was observed to attack young, tender, lateral branches (Fig. IB), the central leaf veins, inflorescences, peduncles, and fruits at the beginning of development (Fig. 2). Lesions in the lateral branches were concentrated at the apex (20 cm from the end) and consisted of an elongated superficial scraping, ranging from 10 to 170 mm (Fig. 2A, B). Fruit injuries were 5 mm in diameter, concentrated in the pericarp (shell) and in the initial portion of the mesocarp (pulp), while no attacks on seeds were observed. Oxidation of perseitol, a 7-carbon alcohol compound released from the injured areas of avocado, resulted in the formation of a white exudate of solid consistency (Fig. 2F) (Hoddle & Hoddle 2008). The attack of the floral peduncle in the inflorescences resulted in injury similar to that on the branches, causing the flowers to fall (Fig. 2D).
For comparison of the injuries inflicted by H. freyreissi, the adults were collected in the field and packed in plastic trays containing plant organs without injury. After 3 d, the injuries to the avocado plant organs in the plastic trays were observed to be similar to those in the field. This comparison was made to verify that the injuries were indeed caused by H. freyreissi because similar injuries are caused by other curculionid species as well (Lourengao et al. 1984; Lourengao et al. 2003).
An important observation to note is that the injuries occurring on branches, inflorescences, and young fruits were consistently associated with symptoms of anthracnose disease caused by the fungus Colletotrichum sp. (Silva-Rojas & Avila-Quezada 2011). The attacks on fruits often resulted in fruit drop. Healed lesions on avocados could affect its commercial value, especially that of varieties cultivated for export, because it is considered a defect in fruit quality.
Insects that are associated with disease transmission in plants require greater attention in terms of their presence and management. Important crops can be attacked by curculionid beetles, which are vectors for disease. Rhynchophorus palmarum L. (Coleoptera: Curculionidae) attacks Palmaceae plants and transmits red ring disease of the coconut tree caused by the nematode Bursaphelenchus cocophilus Cobb (Nematoda: Aphelenchida: Parasitaphelenchidae) (Giblin-Davis et al. 2013). Similarly, banana crops (Musa spp. [Musaceae]) may be attacked by Cosmopolites sordidus Germar (Coleoptera:Curculionidae), a potential vector for the fungus Fusarium oxysporum Schlechtendahl (Nectriaceae) (Meldrum et al. 2013). In the case of avocado trees, several species of coleopterans can transmit the fungus Raffaelea lauricola T. C. Harr., (Ascomycota: Ophiostomataceae), which causes laurel wilt disease (Ploetz et al. 2017). A key point to be highlighted is that H. freyreissi attacks various avocado plant organs. Therefore, the injuries can occur at various stages of the crop development cycle, highlighting the necessity for crop management throughout the year.
To our knowledge, this is the first report of H. freyreissi as an avocado tree pest. Here, we describe the injuries caused by H. freyreissi to different plant organs and its association with the pathogen Colletotrichum sp., thus highlighting the potential of this insect to negatively affect avocado production.
We acknowledge Dr. Marinez Isaac Marques, Dr. Wesley Oliveira de Sousa, and Aline de Oliveira Lira for identification of the species. We thank the Tsuge Farm for the partnership and support in the development of this work. Funding was provided by the Coordenagao de Aperfeigoamento de Pessoal de Nivel Superior (CAPES), Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), and Fundagao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG).
Curculionid beetles are significant pests of avocado trees (Persea americana [Lauraceae]). Adults of Heilus freyreissi (Coleoptera: Curculionidae) are reported for the first time on avocado trees, feeding on the tender lateral branches, the central leaf vein, inflorescences, peduncles, and fruits at the beginning of development. These injuries were consistently associated with symptoms of anthracnose disease caused by the fungus Colletotrichum sp. Thus, infestation of this insect maybe of great economic significance in avocado production, because of its ability to attack various plant organs as well as it being a vector of the pathogen Colletotrichum sp.
Key words: beetle; fungal disease; Molytinae; Persea americana; pest
Besouros curculionideos sao importantes pragas em arvores de abacate (Persea americana). Adultos de Heilus freyreissi (Coleoptera: Curculionidae) foram reportados pela primeira vez se alimentando de ramos laterals jovens, da nervura central das folhas, inflorescencias, pedunculos e frutos no inicio do desenvolvimento. As injurias estavam constantemente associadas com sintomas da doenga antracnose causada pelo fungo Colletotricum sp. Assim, a infestagao desse inseto pode ter grande significancia economica para a produgao do abacate, por atacar varios orgaos da planta e ainda estar associado ao patogeno Colletotrichum sp.
Palavras Chave: besouro; doenga fungica; Molytinae; Persea americana; praga
Alvares CA, Stape JL, Sentelhas PC, Goncalves JLM, Sparovek G. 2013. Koppen's climate classification map for Brazil. Meteorologische Zeitschrift 22: 711-728.
Carrillo D, Duncan RE, Pena JE. 2012. Ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) that breed in avocado wood in Florida. Florida Entomologist 95: 573-579.
Castaneda-Vildozola A, Franco-Mora O, Aleman JCR, Ruiz-Montiel C, Valdez-Carrasco J, Equihua-Martfnez A. 2015. New distribution records of the small avocado seed weevil, Conotrachelus perseae Barber (Coleoptera: Curculionidae), in Mexico and notes on its biology. The Coleopterists Bulletin 69: 267-271.
CTFB. 2017. Lista de especies validas encontradas no territorio nacional, http://fauna, jbrj.gov.br/fauna/lista Brasil/Principal UC/PrincipalUC.do?lingua=pt/(last accessed 25 Apr 2017).
Giblin-Davis RM, Kanzaki N, Davies KA. 2013. Nematodes that ride insects: unforeseen consequences of arriving species. Florida Entomologist 96: 770-780.
Hoddle MS, Hoddle CD. 2008. Bioecology of Stenoma catenifer (Lepidoptera: Elachistidae) and associated larval parasitoids reared from Hass avocados in Guatemala. Journal of Economic Entomology 101: 692-698.
Lourencao AL, Rosado-Neto GH, Soares NB. 1984. Ocorrencia de adultos de HeilipuscatagraphusGermar, 1824 (Coleoptera: Curculionidae) danificando frutos de abacateiro. Bragantia 43: 249-253.
Lourencao AL, Soares NB, Rosado-Neto GH. 2003. Ocorrencia e danos de larvas de Heilipus rufipes Perty (Coleoptera: Curculionidae) em abacateiro [Persea americana Mill.) no Estado do Ceara. Neotropical Entomology 32: 363-364.
Meldrum RA, Daly AM, Tran-Nguyen LTT, Aitken EAB. 2013. Are banana weevil borers a vector in spreading Fusarium oxysporumf. sp. cubense tropical race 4 in banana plantations? Australasian Plant Pathology 42: 543-549.
O'Brien CW, Wibmer GJ. 1982. Annotated checklist of the weevils (Curculionidae sensu lato) of North America, Central America, and the West Indies (Coleoptera: Curculionoidea). Memoirs of the American Entomological Institute 34.
O'Donnell K, Libeskind-Hadas R, Hulcr J, Bateman C, Kasson MT, Ploetz RC, Konkol JL, Ploetz JN, Carrillo D, Campbell A, Duncan RE, Liyanage PNH, Eskalen A, Lynch SC, Geiser DM, Freeman S, Mendel Z, Sharon M, Aoki T, Cosse AA, Rooney AR 2016. Invasive Asian Fusarium-Euwallacea ambrosia beetle mutualists pose a serious threat to forests, urban landscapes and the avocado industry. Phytoparasitica 44: 435-442.
Ploetz RC, Konkol JL, Narvaez T, Duncan RE, Saucedo RJ, Campbell A, Mantilla J, Carrillo D, Kendra PE. 2017. Presence and prevalence of Raffaelea lauricola, cause of laurel wilt, in different species of ambrosia beetle in Florida, USA. Journal of Economic Entomology 110: 347-354.
Silva-Rojas HV, Avila-Quezada GD. 2011. Phylogenese and morphological identification of Colletotrichum boninense: a novel causal agent of anthracnose in avocado. Plant Pathology 60: 899-908.
Splink (Species link). 2017. Colecao Entomologica Pe. Jesus Santiago Moure (Coleoptera) - DZUP-Coleoptera. http://www.splink.org.br/ (last accessed 25 Apr 2017).
Vanin SA, Bena DC. 2015. A new species of Heilipus Germar (Coleoptera: Curculionidae: Molytinae) associated with commercial species of Annonaceae in Brazil, and comments on other species of the genus causing damage to avocado trees in Brazil. Zootaxa 3905: 541-556.
Wibmer GJ, O'Brien CW. 1986. Annotated checklist of the weevils (Curculionidae sensu lato) of South America (Coleoptera: Curculionoidea). Memoirs of the American Entomological Institute 39.
Diarly Sebastiao dos Reis (1,*), Lucas Gongalves Machado (2), Ezio Marques da Silva (1), and Flavio Lemes Fernandes (1)
(1) Universidade Federal de Vinosa Campus Rio Paranaiba, Instituto de Ciencias Agrarias, Rio Paranaiba, Minas Gerais 38.810-000, Brasil; E-mail: firstname.lastname@example.org (D. S. R.), email@example.com (E. M. S.), firstname.lastname@example.org (F. L. F.)
(2) Grupo Tsuge, Rio Paranaiba, Minas Gerais 38.810-000, Brasil; E-mail: email@example.com (L. G. M.)
(*) Corresponding author; E-mail: firstname.lastname@example.org
Caption: Fig. 1. Adult Heilus freyreissi isolated (A, B) and aggregated under the bark of the trunk of an avocado (C). The white ellipse indicates the location of the aggregation of adult beetles.
Caption: Fig. 2. Injury caused by adults of Heilus freyreissi on branches (A, B), avocado central leaf vein (C), inflorescence (D), peduncle (E), and fruit (F).
Please Note: Illustration(s) are not available due to copyright restrictions.
|Printer friendly Cite/link Email Feedback|
|Author:||dos Reis, Diarly Sebastiao; Machado, Lucas Gongalves; da Silva, Ezio Marques; Fernandes, Flavio Leme|
|Date:||Jun 1, 2018|
|Previous Article:||First record of the sweet potato pest Bedellia somnulentella (Lepidoptera: Bedelliidae) in Brazil.|
|Next Article:||Acoustic detection of Mallodon dasystomus (Coleoptera: Cerambycidae) in Persea americana (Laurales: Lauraceae) branch stumps.|